Roller mill



ott. 8, 1929.` A. VOEGEL 1,730,906

\ ROLLER MILL Filed Sept. 30, 1926 www@ 6 3 PL g ll l I 1 Q O 2 o y/)ZlwlZ/f, 18

fi U

esi-aaai oa. e, 1929 VATNT FFlCE AUGUST VOEGEL, OF IIAGDEBU'RG, GERANY, ASSTLGLOR TG THE FIRM FRIED. KRUPP GRSGNERK AKTIENGESELLSCrzl-FT, CJEF MAGDEBURG-BUCKU, GERMANY Application filed September 30, 1926, Serial No. 38,73%

My invention relates to roller mills, representing crushing, grinding, squeezing and comminuting machines capable of general application but preferably being used tor reducing hard substances like ores, minerals and the like into line particles.

My invention has special reiterence to that type oi' roller mills, comprising a set of crushing rolls of which one is niovably i. e. yieldin mounted on the trame oi the mill and is resiliently held in its operative position relatively to the stationarily mounted roller or rollers, so as to permit the occasional passage oit 'foreign substances, such as broken mining tools, bolts, nuts and the like.

The object oi my invention is to provide simple durable and e'liicient means for yieldingly carrying the movable roll, and tor speedily adjusting and properly guiding the L la'- r and its carrier res aectivelv. Another oi ct aimed at by this invention is to completely eliminate those drawbacks commonly attached to mills ott the type under discussion: Said drawbacks, as known to those tamiliar with the working ot said mills comprise the displacement occurring at the crushing rollers, which as the result of uneven strains wear and tear tend to take up a diverging position, i. e. obliquely to each other, secondly the dilticulties and impediments, ottering themselves in changing'or readjusting the distance between the main rolls, i, e. the space between their circumferential working surfaces, andlast not least-the heavy vibrations and s locks, imparted to the whole iframe work of the mill as the result of unequal strains on the rolls and uneven wear ot the members for guiding the yielding roll in its reciprocative movements during the crushing operation. n

The nature and scope of my invention `are briefly outlined in the appended claims and 'will be more fully understood by the ifollowing speciiication taken together with the ac- -companying drawing, in which an embodiment oi my invention is shown by way ot an example and ot which- Fig. l is a side elevation, partly in section, taken on line A+B of Fig. 2;

Fig. 2 is a plan view;

and in Germany October 2, 1925.

3 is a transverse section, taken on line C-U in Fig. l.

As indicated in Figs. l and 2, the roll l is mounted in rigid brackets of the main frame G. rllhe roll 2 is mounted in bearings 3 of an auxiliary U-shaped trame 4', 5, which is carried on guide portions lll ot the main frame and is yieldingly secured thereto by means of a screw bolt 9. The latter extends through a bracket l of the trame 6 and through the central portion 7 of the ri-trame, which yieldingly is held in its position by a spring 8, a cap 8 and nut 9 at its rear side and at the inner side by a series ot insertion plates l2, mounted on the bolt 9. Said insertion plates are designed in any convenient manner known per se in the art, so as to be easily exchangeable and thus permit the width of the gap between the rolls l and 2 to be varied. Discs 13 ot. elastic material e. g. of india rubber may be also interposed between the bracket l0 ot the main trame and the central portion 7 ot the auxiliary trame, in order to take up the yheavy shocks occurring at the return movements of the roll 2 into its initial position, after it has yielded tor the passage of obstructing material.

ln order to hold the arms 4 constantly against the gliding surface 14 of the frame, even when the surfaces wear away unequally, and thereby to prevent harmful chattering, a pressure spring 15 (Fig. is mounted on each arinll. The spring rests upon a collar 16 and presses upward against a cap 17, which is held in place by the nut i9 oi bolt 18. The screw bolt i8 is pivoted at 18a on the main 'traine .an d entends through the annular member lo, which is supported by ournals 20, the latter being mounted in brackets a, provided on the frame l as indicated in Fig. 3, and adapted to swing about the journals 2O parallel tothe aXis of t ie rolls.

rlhus the springs 15 will always be automatically adjusted and rwill be kept in their normal 1position relative to the annular member 16 during the yielding movements of the roll and the U-shaped ramerespectively.

"Various changes mayoler themselves to those Askilled in the art as to the design and the cooper'ationvof the component parts of they cib mill, e. g. of the means for yieldingly secure ing the roll 2 in its operation, described hereinbefore without substantially departing from the spirit and the leading ideas of my invention.

lVha-t I claim is:

1. A roller mill comprising a main frame, a crushing roll stationarily mounted on'said Vmain frame, a yoke slidably mounted on said main frame, a second crushing roll on said yoke, an abutment on said main frame between the cross piece of said yoke and said second crushing roll, insertion pla-tes interposed between said cross piece and said abutment for regulating the least distance between said rolls, and yieldable means opposing movement of said second roll away from said irst mentioned roll.

2. A roller mill comprising a main frame, a crushing roll stationarily mounted on said main frame, a yoke slidably mounted on said main frame, a second crushing roll on said yoke, an abutment on said main frame between the cross piece of said yoke and said second crushing roll, a resilient buffer interposed between said cross piece and said abutment for limiting the movement of said second roll toward said iirst mentioned roll, and yieldable means opposing movement of said second roll away from said first mentioned roll.

3. A roller mill comprising a main frame, a crushing roll stationarily mounted on said main frame, a yoke slidably mounted on said main frame, a second crushing roll on said yoke, an abutment on said main frame be tween the cross piece oie said yoke and said second crushing roll, a bolt secured to said abutment and slidably extending through said cross piece, a cap on the outer end of said bolt, resilient means mounted on said bolt between said cap andsaid cross piece for opposing movement of said second roll away from said first mentioned roll, and insertion plates and a resilient buier mounted on said bolt between said cross piece and said abutment for limiting movement or" said second roll toward said iirst mentioned roll'.

d. A roller mill comprising a main frame having spaced Ouide portions, a crushing roll stationarily mounted on said frame, a yoke having two arms restingon said guide portions, a second crushing roll mounted on said yoke, yieldable means opposing motion of said second roll away from said rst mentioned roll, and a pressure element associated with each arm of said yoke for maintaining the same in contact with their respective guide portions.

5. A roller mill in accordance with claim i in which each of said pressure elements comprises a bolt pivoted to the guide portion or" the main frame and extending through the arm of the yoke,a cap on the end of said bolt, a plate horizontally pivoted on said arm at AUGUST VGEGEL. 

